Jordan Creek IA 04-RAC-1982

mouth (SW1/4 S14 T78N R25W Polk Co.) to headwaters in NW1/4 T78N R26W Sec7) Polk Co

This is a DRAFT assessment

Draft assessments may change without notice

Open Data Collection Period Modal

For purposes of developing stream/river water quality assessments for integrated reporting, three years of water quality data are typically used for both conventional pollutant parameters (e.g., indicator bacteria) and the less frequently monitored toxic parameters (e.g., toxic metals). Since the 2004 IR cycle, DNR has used a three-year data gathering period for streams, rivers, and beaches. For most assessments, the use of three years of data increases the number of samples upon which the decision on use support is based and helps address the problem of weather-related year-to-year fluctuations in water quality.

Due to the lower sampling frequency in Iowa’s ambient lake, biological, fish kill, and fish tissue monitoring programs, five years of data are used for developing IR assessments and for identifying Section 303(d) listings.

Data Type	Data Timeframe
Beach Sampling Data	CY 2022 - 2024
Stream/River Water Quality Data	CY 2022 - 2024
Lake Water Quality Data	CY 2020 - 2024
Biological Sampling Data	CY 2020 - 2024*
Fish Kill Data	CY 2020 - 2024
Fish Tissue Sampling Data	CY 2020 - 2024
Continuous Dissolved Oxygen Sampling Data	CY 2020 - 2024
*Biological sites sampled in both 2019 and 2023 were also assessed.

Open Segment Map
View 2026 assessment summary page

Cycle: 2026
Current Phase: Public Comment
Overall IR: 2 - Some of the designated uses are met but there is insufficient data to determine if remaining designated uses are met.
Trend: Unknown
Created: 12/19/2025 9:34:09 AM
Updated: 1/14/2026 8:58:44 AM

Use Support

Class A1

Presumptive Use

Recreation - Primary contact

Not Assessed

Class BWW1

Presumptive Use

Aquatic Life - Warm Water Type 1

Fully Supported

Impairment Delistings

No delistings for this assessment cycle.

Documentation

Assessment Summary

The presumptive Class BWW1 use was assessed as "fully supported" based on water quality data. All other designated uses were not assessed.

Assessment Explanation

Data Sources:

Data Source	Data Source ID	Data Type	Data Age	Site ID	Site Name	Site Description
PCCB	29	WQ	CY 2022-2024	99990298	Jordan Creek at Grand Ave
PCCB	29	WQ	CY 2022-2024	99990254	Jordan Creek near Mills Civic Pkwy
PCCB	29	WQ	CY 2022-2024	99990256	Jordan Creek near EP true Pkwy
PCCB	29	WQ	CY 2022-2024	99990270	Jordan Creek at Prairie View Dr
PCCB	29	WQ	CY 2022-2024	99990275	Jordan Creek at Iowa Rd

Presumptive Class A1 - No Data

Presumptive Class BWW1 - Binomial Parameters:

Site ID	Data Source ID	Parameter Name	# Samples / # Years	Minimum Value	Maximum Value	Mean Value	# Violations	# Acute / Chronic Violations	Violations needed for impairment	Violates Significantly >10% Rule?	Assessment Type	Support Level
99990298	29	Chloride	6 / 2	90.33	165.65	129.72	NA	0 / 0	3	NO	EVALUATED	FULL
99990298	29	Sulfate	6 / 2	38.07	84.36	67.06	0	NA / NA	3	NO	EVALUATED	FULL
99990254	29	Temperature	62 / 3	0	31.1111	13.71	0	NA / NA	10	NO	MONITORED	FULL
99990256	29	Temperature	60 / 3	0	26.6667	14.657	0	NA / NA	10	NO	MONITORED	FULL
99990270	29	Temperature	60 / 3	1.11111	32.2222	14.037	1	NA / NA	10	NO	MONITORED	FULL
99990275	29	Temperature	45 / 3	2.22222	27.7778	15.938	0	NA / NA	8	NO	MONITORED	FULL
99990298	29	Temperature	6 / 3	15	22.7778	18.704	0	NA / NA	3	NO	EVALUATED	FULL

Monitoring and Methods

Assessment Key Dates

1/3/2022

Monitoring Start

12/17/2024

Monitoring End

Methods

200

Physical/Chemical Monitoring

860

Other Agencies/Organizations provided monitoring data